Maybe create a 3rd fx channel which you can build an fx chain similar to a guitar multi fx unit would be very versatile , Be nice to switch each fx channel no/off via foot switch, with each button switchable between "on/off" & momentary (Bluetooth maybe?)

Not instead of that's silly if you understand delay it can be tightened up to create reverb but reverb cannot produce delay? Add a way to patch effects plug ins for purchase would be the smartest move.